However, other sources have claimed that Microsoft was always targeting today as the day Windows 8.1 would reach RTM status.

Officially, Microsoft hasn't confirmed which date - if any - that the Windows 8.1 update went out to manufacturers. TechRadar asked the company for more information and will update this story when we hear back.

Either way, it's good news that Windows 8.1 has made its way to RTM status, as the Oct. 18 release date will be here before we know it.